基于雷电参数统计的上海电网雷区分布图绘制

Lightning Zone Map Drawing Based on Lightning Parameter Statistics for Shanghai Power Grid

科学的电网雷区分布图绘制是提高当前雷电防护措施针对性、实现电网差异化防雷,提高防雷技术经济性和有效性的重要手段。对上海地区2006～2010年地闪密度分布及雷电流幅值概率分布进行了统计,结合500 kV输电线路典型杆塔绝缘水平、多年运行经验以及地形地貌等影响因素特征,基于网格划分法、分辨率为0.01°×0.01°,绘制了由上海电网地闪密度分布图和500 kV电压等级的电网绕击/反击雷害风险分布图组成的上海电网雷区分布图。该电网雷区分布图与500 kV输电线路雷害故障历史记录有着良好的相关性。

Scientific lightning zone map drawing can improve the pertinence and effectiveness of lightning protection measures for power grid and realize the differentiated lightning protection technology. In this paper, the statistics were made about the ground flash density （GFD） distribution and lightning current amplitude probability distribution from the year 2006 to 2010 in Shanghai respectively. Considering the influencing factors （ typical tower insulation level of 500 kV transmission line, the long-term operation experience, and the local topography, etc. ）, the lightning zone map of Shanghai power grid has been drawn based on mesh generation method and 0.01°×0.01° resolution, which is composed of the GFD map and the hazard distribution map of lightning shielding failure and back flashover for 500 kV power grid. The analysis results show that this lightning zone map shows a close relevance to the historical records of lightning faults of 500 kV transmission lines.